Bathroom types
Annexe and outbuilding bathrooms
What decides the layout
- Supply pipework crossing an unheated void needs proper insulation and
- where possible, a drain-down point for long periods of non-use.
- Waste connections to the main house drainage
- need permission-level thinking about invert levels rather than an assumption that it will fall.
- Where the annexe is used by an older relative
- planning for future grab rails at the boarding stage costs almost nothing now.
Before you commit
Waste connections to the main house drainage need permission-level thinking about invert levels rather than an assumption that it will fall.


Your questions answered
Does an annexe bathroom need separate isolation?
It should have its own stopcock and isolators so it can be worked on or drained without shutting the main house down.
What about heating and drying the room?
Good extraction plus a heated towel rail is usually enough for a small annexe shower room in regular use.
Want the awkward part looked at first?
Access, existing pipework and floor build-up are the things that change a plan. Those get checked before anything is promised.